Vulnpedia
← All CVEs

CVE-2026-19490

CRITICAL 9.3 KNOWN EXPLOITED ALL-YEARS

Published 2026-08-19 · Last modified 2026-10-07 · NetScaler · NVD: Analyzed

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-09-09. Patch or mitigate now.

Exploitation likelihood

32.7%chance of exploitation in 30 days · 98th percentile

● In CISA KEV (2026-09-09)○ Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

9.3CVSS 4.0 · CRITICAL · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Netscaler Citrix

Products Adc Gateway Netscaler Application Delivery Controller Netscaler Gateway

Weakness (CWE)

  • CWE-288: Authentication Bypass Using an Alternate Path or Channel

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

3 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-09-03T00:00:00Z

    Source guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-19490 · Updated 2026-09-03T00:00:00Z
  • VulnCheck KEV · 2026-09-03T00:00:00ZVulnCheck KEV · CVE-2026-19490
  • VulnCheck KEV · 2026-09-09T00:00:00ZVulnCheck KEV · CVE-2026-19490

Known Affected Software Configurations

VendorProductVersion range
CitrixNetscaler Application Delivery Controller≥ 13.1 and < 13.1-37.277
CitrixNetscaler Application Delivery Controller≥ 13.1 and < 13.1-37.277
CitrixNetscaler Application Delivery Controller≥ 13.1 and < 13.1-63.21
CitrixNetscaler Application Delivery Controller≥ 14.1 and < 14.1-73.32
CitrixNetscaler Application Delivery Controller≥ 14.1-66.68 and ≤ 14.1-73.32
CitrixNetscaler Gateway≥ 13.1 and < 13.1-63.21
CitrixNetscaler Gateway≥ 14.1 and < 14.1-73.32

All CVSS metrics

  • CRITICAL 9.3 v4.0 · CNA Primary
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
  • CRITICAL 9.3 v4.0 · NVD Secondary
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • CRITICAL 9.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS